I think it's easy enough to just change it to "marriage between one man/woman and one man/woman". Conceptually it's very easy, and as long as we understand why were are doing it (aka, we don't think it's because "tradition is stupid, religion is stupid" etc) it will just stick like that. Arguing for polygamy would be a totally different logic.
@PJ: I think that's just a narrow focus, there's plenty of terrible non-christian examples of the things you mention. If christian views of evolution would get laughed out of a 5th grade classroom, the average atheists would get laughed out of an 8th grade classroom (or should). You can see it in this thread if you want. And I don't think most religious people in modern societies believe in the literal truth of that stuff you mention. Non christians accept christians because they like them as people true, but also because they don't believe in myths about rational scientific explanations for the human experience.
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